微波法制备纳米结构铬酸锌的磁学和光学性能(英文)

Magnetic and optical properties of zinc chromite nanostructures prepared by microwave method

采用微波法制备纳米结构铬酸锌(Zn Cr2O4)。结果表明,经700°C退火后Zn Cr2O4为晶型良好的尖晶石结构。研究反应时间和微波照射功率对Zn Cr2O4晶粒尺寸和形貌的影响。分别采用X射线衍射(XRD)、扫描电镜(SEM)、能量分散X射线(EDX)、透射电镜(TEM)、漫反射光谱(DRS)、光致发光(PL)光谱、傅里叶红外光谱(FTIR)等技术及振动样品磁强计对所合成的Zn Cr2O4样品进行表征。由漫反射光谱(DRS)计算得到Zn Cr2O4纳米结构的光带能隙为3.50 e V,光致发光光谱分析也证实了该结果。

The nanostructures of zinc chromite（Zn Cr2O4） were fabricated by the microwave method. It was shown that the well-crystallized spinel structure is formed after annealing at 700 °C. The influence of reaction time and irradiation power of oven on the size and shape of the as-prepared Zn Cr2O4 samples was studied. The synthesized samples were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, energy dispersive X-ray（EDX）, transmission electron microscopy（TEM）, diffuse reflectance spectroscopy（DRS）, photoluminescence（PL） spectroscopy, Fourier transform infrared（FTIR） spectra and vibrating sample magnetometry（VSM）, respectively. The optical band gap calculated using DRS was found to be 3.50 e V for Zn Cr2O4 nanostructures. Photoluminescence measurements also confirmed this result.